We report here four cases of unbalanced chromosomal rearrangements involving partial monosomies and trisomies of chromosome 7. The quantitative expression of diaphorase 2 (DIA-2), beta-glucuronidase (GUS-beta) and argino-succinate-lyase (ASL) were measured in these patients and compared with controls. The results suggest that the DIA-2 locus is in the band 7p221----q21, the GUS-beta locus in the band 7p22----q21 and the ASL locus in the band 7p221----q22.
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Baeteman et al. (1985) studied this question.
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